A few studies have shown that the parallel squat is king for maximizing work and overloading on the muscles . High reps with low to moderate weight gives exercisers the least effective way to overload the lower body muscles. The deep squat can contribute to tight knee joints / kneecap pressure . With this in mind , would you put deep squats in your personal leg workout ?
Personally I don’t do deep squats and I’m not sure what you mean by tight knee joints?
There are many gyms and programs using deep squats routinely regardless of the damage that can potentially occur by not using proper progression.
Again, we are not a regulated industry